Who beats Radditz: Juubito and other Juubi Jinchurikis/Fruit eaters. Juubi/Shinju itself won't be able to do it.
Who beats Nappa: Only Juudara and by extension Kaguya and Hagoromo.
Below the upper top tiers/Juubi variants are Naruto and Sasuke; individually, they can beat down 23rd Budokai Goku and Piccolo without too much of a problem. Together, they could probs beat Pre-Gohan training Piccolo, since he was still noticeably weaker than Radditz, what with Sasuke's instant teleportation that can displace other people as well plus Rikudou-sealing and Naruto's six-fold Rasen-Shuriken Bijuudama barrage that can explode and deliver pinpoint cellular damage at the same time.
Base Vegeta and Goku (after King Kai training) will beat any Naruto character as far as current feats and hype goes.